Question

A simple pendulum of length l and mass (bob) m

is suspended vertically. The string makes an angle

Theta with the vertical. The restoring force acting on

the pendulum, is

(a) mg tan Theta (b) mg sin Theta

(c) - mg sin Theta (d) - mg cos Theta​

Answer 1

Answer:

The situation of a pendulum of length 'l' and mass 'm' given in fig when string makes an angle 'θ' with verticle.

It is clear from fig the component mg cosθ balances the tension of string at the position and the component mg sinθ acting towards its mean position. So it will act as restoring force.